学步园

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1、自定义MyButton类

public class MyButton extends Button {

//This constructormust be 

public MyButton(Context context, AttributeSet attrs) {
  super(context, attrs);
 }

 public MyButton(Context context) {
  super(context);
 }

 private Paint mPaint = null;
 private String mText;
 private int mX, mY;

 public void onSetText(String text, int nLeft, int nBottom, int nTextSize,
   int nTextColor) {
  mPaint = new Paint();
  mPaint.setTextSize(nTextSize);
  mPaint.setColor(nTextColor);
  this.mText = text;
  this.mX = nLeft;
  this.mY = nBottom;
 }

 private int mDownBmpId, mUpBmpId;

 public void onSetBmp(int nDownID, int nUpID) {
  this.mDownBmpId = nDownID;
  this.mUpBmpId = nUpID;
 }

 @Override
 public void onDraw(Canvas canvas) {

  if (mPaint != null)
   canvas.drawText(mText, mX, mY, mPaint);
  super.onDraw(canvas);
 }

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  if (event.getAction() == MotionEvent.ACTION_DOWN) {
   super.setBackgroundResource(mDownBmpId);
  } else if (event.getAction() == MotionEvent.ACTION_UP) {
   super.setBackgroundResource(mUpBmpId);
  }
  return super.onTouchEvent(event);
 }
}

2、 在xml布局文件中添加MyButton控件，像应用普通的Button控件一样。

  <com.MyButton
   android:id="@+id/test_btn" android:layout_width="120px"
   android:layout_height="fill_parent" android:text="Test"
   android:background="@drawable/btn_u" />

其中com.MyButton是你定义的MyButton类所在的包名

3、在onCreate()中加载MyButton控件。

  MyButton btn = (MyButton)findViewById(R.id.test_btn);
  btn.onSetBmp(R.drawable.btn_d, R.drawable.btn_u);

其中btn_d表示为按下btn时背景图片，btn_u为默认状态下btn背景图片